For their sample period,monthly expiration dates were available up to 18 months into the future

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For their sample period,monthly expiration dates were available up to 18 months into the future

采样期间,有效期可长太（未来的）18个月
这里into the future不译出即可,因为18个月,已经含有未来的意思了

对于他们的样本期间，每月到期日期是可长达18个月到未来